When you say you followed the recipe exactly, that phrase itself is ambiguous.
Measuring flour seems to be what the problem is here.
ChefTalk forums have a lot to say about this.
If the recipe calls for x cups of flour and you find you have to add a little more to get the desired consistency, so what?
Recipes are just guidelines and with practice, you will find this out.
There are so many variables with regard to baking; the temperature of your kitchen,...